We tried applying the suggested patch from novell against the
2.6.18.dfsg.1-13etch1 kernel source and continue to see the problem.
Turning off vdso at boot or dynamically does work for us.
The problem didn't appear when running the linux-image-2.6.21-2-k7
(2.6.21-6) kernel.
Sam, what kernel did you apply the patch to that worked for you?
Mark